Buggy code:
public abstract class Prompt extends SurveyItem { public static final String JSON_KEY_UNIT = "unit" ; public static final String JSON_KEY_TEXT = "text" ; public static final String JSON_KEY_ABBREVIATED_TEXT = "abbreviated_text" ; public static final String JSON_KEY_EXPLANATION_TEXT = "explanation_text" ; public static final String JSON_KEY_SKIPPABLE = "skippable" ; public static final String JSON_KEY_SKIP_LABEL = "skip_label" ; public static final String JSON_KEY_PROMPT_TYPE = "prompt_type" ; public static final String JSON_KEY_DISPLAY_TYPE = "display_type" ; public static final String JSON_KEY_DISPLAY_LABEL = "display_label" ; private final String unit ; private final String text ; private final String abbreviatedText ; private final String explanationText ; private final boolean skippable ; private final String skipLabel ; public static enum DisplayType { MEASUREMENT , EVENT , COUNT , CATEGORY , METADATA ; @ Override public String toString ( ) { } } private final Prompt . DisplayType displayType ; private final String displayLabel ; public static enum Type { TIMESTAMP , NUMBER , HOURS_BEFORE_NOW , TEXT , SINGLE_CHOICE , SINGLE_CHOICE_CUSTOM , MULTI_CHOICE , MULTI_CHOICE_CUSTOM , PHOTO , REMOTE_ACTIVITY ; @ Override public String toString ( ) { } } private final Prompt . Type type ; public static final class LabelValuePair { public static final String JSON_KEY_LABEL = "label" ; public static final String JSON_KEY_VALUE = "value" ; private final String label ; private final Number value ; public LabelValuePair ( final String label , final Number value ) throws DomainException { } public String getLabel ( ) { } public Number getValue ( ) { } public JSONObject toJson ( ) throws JSONException { } @ Override public int hashCode ( ) { } @ Override public boolean equals ( Object obj ) { } } public Prompt ( final String id , final String condition , final String unit , final String text , final String abbreviatedText , final String explanationText , final boolean skippable , final String skipLabel , final Prompt . DisplayType displayType , final String displayLabel , final Prompt . Type type , final int index ) throws DomainException { } public String getUnit ( ) { } public String getText ( ) { } public String getAbbreviatedText ( ) { } public String getExplanationText ( ) { } public boolean skippable ( ) { } public String getSkipLabel ( ) { } public Prompt . DisplayType getDisplayType ( ) { } public String getDisplayLabel ( ) { } public Prompt . Type getType ( ) { } @ Override public final int getNumSurveyItems ( ) { } @ Override public final int getNumPrompts ( ) { } @ Override public JSONObject toJson ( ) throws JSONException { } public abstract void validateConditionValuePair ( final ConditionValuePair pair ) throws DomainException { } public abstract Object validateValue ( final Object value ) throws DomainException { } public abstract PromptResponse createResponse ( final Integer repeatableSetIteration , final Object value ) throws DomainException { } @ Override public int hashCode ( ) { } @ Override public boolean equals ( Object obj ) { } protected final boolean checkNoResponseConditionValuePair ( final ConditionValuePair pair ) throws DomainException { try { <START_BUG> NoResponse noResponse = NoResponse . valueOf ( pair . getValue ( ) ) ; <END_BUG> switch ( noResponse ) { case SKIPPED : if ( skippable ( ) ) { return true ; } else { throw new DomainException ( ( ( "The<seq2seq4repair_space>response<seq2seq4repair_space>'" + ( getId ( ) ) ) + "'<seq2seq4repair_space>cannot<seq2seq4repair_space>be<seq2seq4repair_space>skipped,<seq2seq4repair_space>so<seq2seq4repair_space>the<seq2seq4repair_space>condition<seq2seq4repair_space>is<seq2seq4repair_space>invalid." ) ) ; } case NOT_DISPLAYED : return true ; default : throw new DomainException ( "Unknown<seq2seq4repair_space>'no<seq2seq4repair_space>response'<seq2seq4repair_space>value." ) ; } } catch ( IllegalArgumentException e ) { return false ; } } }

Fix:
NoResponse noResponse = NoResponse . valueOf ( pair . getValue ( ) . toUpperCase ( ) ) ;